Coating composition



Reiuued June 18, 1935 UNITED STATES PATENT OFFICE COATING COMPOSITIONWilliam Koch, Wilmington, Del., uelgnor to Hercules Powder Company,Wilmington, DeL, a corporation of Delaware No Drawing.

Orlg'inal No. 1,957,786, dated M1! 8, 1934, Serial No. 626,226. Jill!29. 1932.

This invention relates to an improvement in coating compositions andmore particularly to coating compositions which while adaptable for usegenerally lend themselves especially for use 5 where a corrosion andabrasion resistant coating is desired, as for example, various metalsurfaces, pipes to be buried in the ground, etc.

Coating compositions in accordance with this invention will containessentially chlorinated rubber and an ester of abietic acid, as, forexample, alkyl and aralkyl derivatives. The ester of abietic acid orrosin as contained in the compositions in accordance with this inventionmay be hydrogenated either by hydrogenation of the ester or by producingthe ester from hydrogenated abietic acid or rosin.

Compositions in accordance with this invention, in addition to theessential ingredients described above, may contain various otheringredients, as, for example, gums, oils, etc. and will contain asuitable solvent or solvent mixture to give to the compositions desiredviscosity or fluidity to enable their application, as for example, byspraying, brushing, dipping or otherwise, as may be desired.

The chlorinated rubber comprising one of the essential ingredients ofcoating compositions in accordance with this invention may be eitherchlorinated raw rubber or chlorinated vulcan- 30 lzed rubber, ormixtures thereof, both being contemplated as within the term chlorinatedrubber as used herein. While the chlorinated rubber will preferably havea relatively high percentage of chlorine, say above 67%, it will beunderstood that rubber containing any substantial percentage ofchlorine, say as low as 50%, will be usable.

The chlorinated rubber, either raw or vulcanized, may be obtained fromany source, or may be produced in any suitable manner. Thus, forexample, suitable chlorinated rubber may be produced from raw orvulcanized rubber by dissolving the rubber in a solvent, as carbontetrachloride, which will be unaiiected by chlorine, heating thesolution to a temperature within the range 80-110 C. and introducingchlorine into the heated solution. Where vulcanized rubber is treatedthe sulphur will be separated out by the chlorine, appearing as achloride of sulphur, 50 all, as for example, is more fully disclosed inU. S. Patent No. 1,852,043 to Deseniss and Nielson.

Other methods for the production of suitably chlorinated rubber aredisclosed, tor example. in the United States patents to Carlton EllisNo. 1,544,530 and No. 1,544,529, to Peachey No.

1,234,381 and to Desenlss and Nielsen No. 1,852,- 043. It will, ofcourse, be understood that suitably chlorinated rubber ior use inconnection with this invention may be produced in any desired manner,the reierences made herein being for illustrative purposes only.

Various esters of abietic acid or rosin may be used in the compositionin accordance with this invention, as for example, ethyl abietate,methyl abietate, propyl abietate, benzyl abietate, etc., etc. Abieticacid or rosin esters as used may be hydrogenated as has been indicated,and it will be understood that with reference to such esters in thedescription of compositions in accordance with this invention heretoforeand as used in the claims appended hereto, bythe term "abietic acid orrosin ester" such esters, either hydrogenated or not hydrogenated,is'contemplated.

As has been indicated, various ingredients in addition to thoseindicated above as essential may be included in compositions inaccordance with this invention, as for example, oils, as linseed oil,China wood oil, etc., etc., gums or resins, as ester gum, coumarone,phenol-iormaldehyde condensation resins etc., pigments and otheringredients which may be desirable and which are compatible with theessential ingredients, chlorinated rubber and abietic acid or resinester.

Any suitable solvent or solvent mixture may be used in the preparation01' solvent mixtures in accordance with this invention and, for example,a mixture of xylol and toluol, ethylene dichloride, monoalkylated etheroi ethylene glycol, ethyl acetate, etc., may be used.

In the formation of compositions in accordance with this invention theessential ingredients may be used in widely varying proportions andother ingredients which may be included may likewise be included inwidely varying proportions.

For illustration, for example, chlorinated rubber may be used in amountwithin say about the range 10-40%, while an abietic acid or resin acidester may be included within say about the range 2-20%. The solvent orsolvent mixture may be used in any desired amount with consideration forthe viscosity or fluidity desired for the composition. Thus, forexample, the solvent or solvent mixture may be in amount within sayabout the range 85-40%, to give compositions which may be readilyapplied as by brushing, spraying, dipping or the like.

As illustrative of the practical adaptation of this invention, forexample, satisfactory compositionsforvarioususesmaybemadeuponthefollowing formula:

It will be understood that abietic acid or resin ester, as methylabietate which has not been bydrogenated, may be substituted forhydrogenated methyl abietate given in the above formula.

The composition in accordance with the above formula! will be founddesirable for various uses and will be found especially desirable wherea corrosion resistant coating is desired. As will be appreciated, theformulations given above for purposes of illustration may be widelyvaried depending upon the particular uses for which they are intendedwithin the scope of this invention.

As has been indicated. the compositions in accordance with thisinvention may be applied to various surfaces such as wood, metal and thelike, by spraying, brushing, dipping, etc., and on evaporation of thevolatile ingredients will form a coating having excellent adherence tothe surface, of desirable appearance, flexibility, etc., etc., and avery high resistance to corrosion.

What I claim and desire to protect by Letters Patent is:

1. A coating composition including chlorinatedrubberandanabieticacidesteroithegroup alkyl and aralhl esters and asolvent.

2. A coating composition including chlorinated rubber and a by abieticacid ester ofthegrmipalhlandaralkylestersandasolvent.

3. A coating composition including chlorinatedrubberandanabieticacidesterofthegroup alkyland aralkylesters,aresinandasolvent.

4. A coating co including chlorinatedrubberandanabieticscidesterofthegrmp alkyl and aralkyl esters. a dryingoil and a solvent.

5. A coating composition including chlorinated rubber and an abieticacid ester d the group aikylandaralkylesteraaresimadryingoiland asolvent.

6. A coating composition including chlorinated rubberabout10-40%andanabieflcacidester abouts-20% ofihegroupalkylandaralkylestersand a solvent.

'1. A coating composition inclmling chlorinated rubber about 20% and anabietic acid ester about 2-6% ufthegrmipalkyisndaralkylestersand asolvent.

8. A coating composition including chlorinated rubber about 20% and anabietic acid ester about 24% of the group alkyl and aralkvl esters and asolvent about 9. In combination a surface and a dim containingchlorinated rubber and an abietic acid ester of the group alkyl andaralkyl esters adhered to and supported on said surface.

10. In combination a surface and a film containing chlorinated rubberand a hydrogenated abietic acid ester of the group alkyl and aralkylesters adhered to and supported on said surface.

11. In combination a metal surface and a film containing chlorinatedrubber and an abietic acid ester of the group alkyl and aralkyl adheredto and supported on said surface.

12. A composition including chlorinated rubber and an abietic acid esterof the group alkyl and aralkyl esters.

13. A composition including chlorinated rubber and a hydrogenatedabietic acid ester of the group alkyl and aralkyl esters.

14. A composition including chlorinated rubber, an abietic acid ester ofthe group alkyl and aralkyl esters and a resin.

15. A composition including chlorinated rubber, an abietic acid ester ofthe group alkyl and aralkylesters,aresinandadryingoil.

16. A composition including chlorinated rubher, an abietic acid ester ofthe group alkyl and aralkyl esters. a resin and linseed oil.

17. A composition including chlorinated rubber within the range about10%-40% and an ahietic acid ester of the group alkyl and aralkyl esterswithin the range about 2%-20%.

18. A composition including chlorinated rubber, a hydrogenated abieticacid ester of the group alkyl and aralkyl esters, a resin and a dryingoil.

19. A composition including chlorinated rubher, an abietic acid ester ofthe group allryl and aralkyl esters, and a softening agent for thechlorinated rubber.

20. A composition including chlorinated rubber, an abietic acid ester ofthe group alkyl and aralkyl esters and China-wood oil.

21. A composition including chlorinated rubber, an abietic acid ester ofthe group alkyl and aralkyl esters, and boiled China-wood oil.

22. A composition including chlorinated rubher, an abietic acid ester ofthe group alkyl and aralkyl esters, China-wood oil and ester gum.

23. A composition includin chlorinated rubher, an abietic acid ester ofthe group alkyl and aralkyl esters, and ester gum.

wnmni xocn.

